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LOANS HELD FOR INVESTMENT, NET - Deferral Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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CARES Act Loan [Abstract] |  |
Principal balances outstanding | $ 9,249,849 | $ 9,244,661
One-to-four family residential and cooperative/condominium apartment |  |
CARES Act Loan [Abstract] |  |
Principal balances outstanding | 669,099 | 669,282
Commercial real estate ("CRE") |  |
CARES Act Loan [Abstract] |  |
Principal balances outstanding | 3,946,918 | 3,945,948
Commercial and Industrial ("C&I") Loans |  |
CARES Act Loan [Abstract] |  |
Principal balances outstanding | $ 921,009 | $ 933,559

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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